So i installed my own 3 head LG brand mini split about 4 years ago. I ran and flared my own line sets. I pressure tested and ran a vacuum to evacuate the line sets prior opening the condenser service valves (condenser came pre-charged). System has been operating great so i think its safe to say i don't have any leaks and my flares were pretty good.
My outdoor unit supports 4 heads and i want to add this 4th head to a specific bedroom. The line length and elevation change is all within the manufacturer specs.
The question I have is in regards to evacuating the new line set. I assume I'll need to have a pro come out and do a full evacuation of the system to capture the existing R410A and recharge? I don't believe i can just close the service valves (isolating line sets from condenser) and evacuate the line sets myself. I'm assuming R410A is a gas at ambient temp so some portion of the charge stays in the line set?
My outdoor unit supports 4 heads and i want to add this 4th head to a specific bedroom. The line length and elevation change is all within the manufacturer specs.
The question I have is in regards to evacuating the new line set. I assume I'll need to have a pro come out and do a full evacuation of the system to capture the existing R410A and recharge? I don't believe i can just close the service valves (isolating line sets from condenser) and evacuate the line sets myself. I'm assuming R410A is a gas at ambient temp so some portion of the charge stays in the line set?